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// Copyright 2018 The Alephium Authors
// This file is part of the alephium project.
//
// The library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the library. If not, see .

package org.alephium.api.model

import sttp.model.StatusCode
import sttp.tapir.{ValidationResult, Validator}

import org.alephium.api.ApiError
import org.alephium.util.{Duration, TimeStamp}

final case class TimeInterval(from: TimeStamp, toOpt: Option[TimeStamp]) {
  def validateTimeSpan(max: Duration): Either[ApiError[_ <: StatusCode], Unit] = {
    if (durationUnsafe() > max) {
      Left(ApiError.BadRequest(s"Time span cannot be greater than ${max}"))
    } else {
      Right(())
    }
  }

  def to: TimeStamp = toOpt.getOrElse(TimeStamp.now())

  def durationUnsafe(): Duration = to.deltaUnsafe(from)
}

object TimeInterval {
  val validator: Validator[TimeInterval] = Validator.custom { timeInterval =>
    if (timeInterval.from >= timeInterval.to) {
      ValidationResult.Invalid(s"`fromTs` must be before `toTs`")
    } else {
      ValidationResult.Valid
    }
  }

  def apply(from: TimeStamp, to: TimeStamp): TimeInterval = {
    TimeInterval(from, Some(to))
  }
}